Remove copyright strings ifdef'd out

We've ifdef'd out the copyright strings for some time now. Go ahead and
remove the ifdefs. Plus whatever other detritis was left over from other
recent removals. These copyright strings are present in the comments and
are largely from CSRG's attempt at adding their copyright to every
binary file (which modern interpretations of the license doesn't
require).

Sponsored by: Netflix

Remove $FreeBSD$: alt two-line .c pattern

Remove /^\s*__RCSID\("\$FreeBSD\$"\);\n\n/

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

sbin/routed: Remove unused code for sgi and NetBSD.

MFC after: 2 weeks

When bind fails, make sure we closed the socket we tried to bind the
address to.

CID: 978244

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

routed(8): Use arc4random_uniform instead of arc4random.

Use arc4random_uniform() when the desired random number upper bound
is not a power of two.

While here, we don't need srandom() and friends anymore.

Obtained from: OpenBSD (CVS rev. 1.20)

routed(8): Use arc4random.

CID: 1305962
Obtained from: NetBSD (CVS Rev. 1.34, Itojun)

routed(8): use NULL instead of zero for pointers.

Fix a bug which could make routed(8) daemon exit by sending a special RIP
query from a remote machine, and disable accepting it by default. This
requests a routed(8) daemon to dump routing information base for debugging
purpose. An -i flag to enable it has been added.

Spelling fixes for sbin/

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Some constifications

Modernize prototypes (ie: no extern)

Make lots of stuff static.

Use <sys/queue.h> to manage the interface list.

Remove newlines from string argument of __COPYRIGHT(), it results in
assembler warning messages.

- Import the HEAD csup code which is the basis for the cvsmode work.

Update routed to use the RFC 3678 protocol-independent multicast API. Use
IP_MULTICAST_IF with struct ip_mreqn (obtained from Linux) to tell the
stack which interface index to use for sending IPv4 datagrams.

Submitted by: bms
Tested by: phk

Sync up with rhyolite routed 2.31 which fixes the handling of varargs.
Remove -p from usage, it's gone completely now.

PR: 83387
Submited by: arved

Remove #ident directives, they don't exist on the vendor branch anymore.

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core, imp

Virgin import of rhyolite.com routed v2.27

Use srandomdev() for FreeBSD

Import routed-2.22.

Import routed-2.21.

$Revision$ -> $FreeBSD$ (more cleanup needed here)

$Id$ -> $FreeBSD$

Latest-and-greatest routed.
Includes RIPv2 and Router Discovery.

Submitted by: Vernon Schryver <vjs@calcite.rhyolite.com>

Spelling, add rcsid, remove unused #includes.
Convert 1000000 usec to 1 sec 0 usec.
Use provided safe malloc (rtmalloc()) instead of malloc(): exit on allocation
failure.
Correct use of .Nm
Add usage() and use errx().

Fix typo in comment.

Sync man page and usage string. Remove unused -p option from getopt call.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Merge from vendor branch.

New version of Vern's routed. This includes more byte-order fixes,
some MD5 fixes, better tracing, configurable redirect processing,
and a fix to split-horizon/poisoned-reverse treatment.

Submitted by: Vernon J. Schryver <vjs@mica.denver.sgi.com>

For some reason the merge of this file didn't get committed properly.
Who has the conical hat?

Make things compile again.

Latest version of SGI routed courtesy of Vern Schryver. This version
adds the capability to use MD5 authentication as defined in the latest
documents.

Submitted by: Vernon J. Schryver <vjs@mica.denver.sgi.com>

Layer on FreeBSD local changes from old routed.

Virgin import of new BSD/SGI routed. This update contains a number
of important bug fixes.

Obtained from: Vernon J. Schryver <vjs@mica.denver.sgi.com>